29. LaTeX技巧627：Figures and Tables in multicol

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It's possible to have single-column figures and tables with captions, but you might have to fiddle with the placement because they won't 'float'. Put the following before \begin{document}

\makeatletter
\newenvironment{tablehere}
  {\def\@captype{table}}
  {}

\newenvironment{figurehere}
  {\def\@captype{figure}}
  {}
\makeatother

then use figurehere and tablehere where you'd normally use figure[h....] and table[h...]

选自：http://www.eng.cam.ac.uk/help/tpl/textprocessing/multicol_hint.html